Postgresql server to authenticate by kerberos against IPA with AD trust user

Issue

This is how a postgresql server can authenticate using an AD trust user in IPA by kerberos.

Red Hat Enterprise Linux 8.8
IPA server ipaserver.idm.example.com has established a trust with Active Directory domain ad.example.com
Postgresql server is installed on IPA client ipaclient.idm.example.com
IPA subnet is 10.10.10.0/24

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